if we're using the idea that 1 day is equal to 1000 years, that means that
1 year = 365 days
1 day = 24 hours
1 hour = 60 minutes
1 year = 365 * 24 * 60 = 525,600 minutes
so 1 day in this scenario is
1000 x 525,600 = 525,600,000 minutes
meaning that
1 minute = 1/525,600,000 days for this custom scenario